Compound sleeve for flexible shafts.



PATENTED JUNE 3o,.1903.

lNo. 732,415.`

. l A. JANET.y

GOMEOUND SLEEVE EOE FLEXIBLE sEAETs.

APPLICATION FILED 09T. 11, '1902.

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e/ fflarng VPatented. June 30, 1903.

PATENT OFFICE.

ARMAND JANET, OF PARIS, FRANCE.

COM POUND SLEEVE FOR FLEXIBLE SHAFTS* SPECIFICATION forming part of Letters Patent No. 732,415, dated J une 30, 1903.

Application filed October 11, 1902. Serial No. 126,962. (No model.)

T all whom it may concern:

Beit known that I, ARMAND JANET, a citizen of the French Republic, and a resident of Paris, France, have invented certain new and useful Improvements in Compound' Sleeves for Flexible Shafts, of which the following is a specification.

Flexible shafts for the transmission of Vmotive power are frequently mounted in a nonrotating cover or sleeve with the object of determining the direction for the internal rotary.

. my invention; andFig. 2 is a central longitudinal section therethrough, the revoluble flexible core or shaft being indicated in dotted lines.

In carrying out the invention I provide a flexible tube like the hose commonly used for distributing iiuids under pressure. The said hose is constructed of a metal strip d of appropriate size rolled to an angular S form in cross-section and wound spirally in such manner that the edges of one spiral will over and under lap and interlock with the edges of the adjacent spirals on either side, as shown. A suitable packing e, preferably asbestos cord, is introduced, by means of which a tight joint is provided. Such hose has sufficient flexibility to enable it to be curved in any required direction', but is, however, rigid enough to be able to resist any tendency to alterits form or direction without intention. Moreover, being used as a flexible sleeve it is capable of effectually retaining the lubricant/for the internal shafting; but such sleeve by itself is not suflicient as a cover for flexible shafts, because it will soon be rendered defective unless furnished with means for preventing very rapid wear or destruction by the high-speed revolutions of the core, which would wear and cut the thin metal strips very rapidly, so that the sleeve would be no more able to keepthe lubricant, and also on account of the fact that if the flexible shaft is subjected to varying or irregular resistances it may tend to twist or buckle in the interior of the sleeve, and thereby increase the pressure upon local parts of the latterby reason of the irregular working.

In order to counteract the frictional wear and tear caused by the core b, and thus avoid the aforementioned objection,I I introduce a helical spring @between the core of the flexible shaft and theaforesaid metallic hose, preferably wound oppositely to said hose, so as to take up the wear caused by the fric-tional parts,v and this without unduly interfering with the flexibility of the whole. The irregular local pressures are, however, readily communicated through the helical spring, as the latter may expand in diameter, and thereby or lubricant leaking through the joints Of the metallic tubing.

Having now fully described my invention, what I claim, and desire to secure by Letters Patent, is-

1. The compound sleeve consisting of liexible tubing, an internal helical spring in said tubing and an external cover of durable fibrous material, as herein described and for the purpose stated.

2. The compound sleeve for flexible shafts, consisting of the spirally-woun'd overlapping and interlocking metallic strip, the internal helical spring oppositely wound, and the external cover of fibrous material. i

3. The compound sleeve for flexible shafts, consisting of the spirally-wound overlapping and interlocking metallic strip, the internal helical spring, the asbestos packing, and the external cover of fibrous material.

In testimony whereof I have hereunto set my hand in presence of two witnesses.

ARMAND JANET.

Vitnesses ADOLPH .STURM, EDWARD P. MACLEAN.

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